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Journal Article

Crystalline MgF2 whispering gallery mode resonators for enhanced bulk index sensitivity

MPS-Authors
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Zeltner,  R.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Sedlmeir,  F.
Whispering Gallery Mode Resonator, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  G.
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Schwefel,  H. G. L.
Whispering Gallery Mode Resonator, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Zeltner, R., Sedlmeir, F., Leuchs, G., & Schwefel, H. G. L. (2014). Crystalline MgF2 whispering gallery mode resonators for enhanced bulk index sensitivity. EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, 223(10), 1989-1994. doi:10.1140/epjst/e2014-02241-8.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-65A9-1
Abstract
We report on experiments on refractrometric sensing with crystalline Whispering Gallery Mode (WGM) resonators made of magnesium fluoride, which has a refractive index that is only slightly larger than that of water (Delta n approximate to 0.05). The resulting evanescent field of a WGM resonator placed in an aqueous environment penetrates therefore deep into the surrounding medium, which makes it a promising candidate for sensing applications. We measured a bulk index sensitivity of 1.09 nm/RIU (refractive index unit) in a resonator with a radius of R = 2.91mm and intrinsic Q-factors of more than 10(8) in aqueous environments. Furthermore, we describe the fabrication process of crystalline WGM resonators.